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Page 29 mrcool.com
Refrigerant Piping Connection
MINIMUM BEND RADIUS
When bending connective refrigerant piping,
the minimum bending radius is 4 in (10 cm).
See Fig 6.6
.
Table 5.2: Torque Requirements
Outer Diameter
of Pipe (in/mm)
Tightening Torque
(N·m / lb·ft)
Add. Tightening Torque
(N·m / lb·ft)
Ø 0.25 in (6.35 mm) 14.91 N·m (11 lb•ft) 16 N·m (11.8 lb•ft)
Ø 0.375 in (9.52 mm) 24.95
N·m (18.4 lb•ft) 26 N·m (19.18 lb•ft)
Ø 0.5 in (12.7 mm) 34.98 N·m (25.8 lb•ft) 36 N·m (26.55 lb•ft)
Ø 0.63 in (16 mm) 45
N·m (33.19 lb•ft) 47.01N·m (34.67 lb•ft)
DO NOT USE EXCESSIVE TORQUE
Excessive force can break the nut or damage the refrigerant piping. You must not exceed
torque requirements shown in the table above.
Radius
Fig. 5.7
6.
7.
8.
inspect the end of the pipe for cracks and even
R 0.4 ~ 0.8
45
2
90 4
F
Fig. 5.6
Flare Diameter (F)
Min
Pipe Diameter
Ø 1/4 in (6.35 mm)
Ø 3/8 in (9.52 mm)
Ø 1/2 in (12.7 mm)
Ø 5/8 in (16 mm)
Ø 3/4 in ( 19.1mm)
Ø 7/8 in (22 mm)
Ø 0.3 in (8.3mm)
Ø 0.48 in (12.4 mm)
Ø 0.6 in (15.4 mm)
Ø 0.7 in (18.6 mm)
Ø 0.9 in ( 22.9 mm)
Ø 1.06 in (27 mm)
Ø 0.3 in (8.3 mm)
Ø 0.48 in (12.4 mm)
Ø 0.6 in (15.8 mm)
Ø 0.74 in (19 mm)
Ø 0.91 in ( 23.3 mm)
Ø 1.07 in (27.3 mm)
Table 5.1: Flare Diameter
Step 4: Connect pipes
When connecting refrigerant pipes, be careful not
to use excessive torque or to deform the piping in
pipe, then the high-pressure pipe.
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